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CSS

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HTML 

              
                // Array of planet name, distance from sun in AU, and color - used for each iteration below
- var planets = [{name:"mercury", au:.4, color:"silver"}, {name:"venus", au:.7, color:"goldenrod"}, {name:"earth", au:1, color:"deepskyblue"}, {name:"mars", au:1.5, color:"crimson"}, {name:"jupiter", au:5.2, color:"sandybrown"}, {name:"saturn", au:9.6, color:"gold"}, {name:"uranus", au:19.2, color:"cyan"}, {name:"neptune", au:30, color:"dodgerblue"}];

// Mixin for creating SVG orbit, planet, trail, and mask
mixin planetize(planet, au, color)
  -var au = au * 25; // Controls overall zoom level
  -var au2 = au* .55; // Necessary value for circular path
  -var path = "M0,-"+au+" C"+au2+",-"+au+" "+au+",-"+au2+" "+au+",0 C"+au+","+au2+" "+au2+","+au+" 0,"+au+" C-"+au2+","+au+" -"+au+","+au2+" -"+au+",0 C-"+au+",-"+au2+" -"+au2+",-"+au+" 0,-"+au+" Z";
  // Rectangle for planet's trail
  clipPath(id="trail"+planet)
    rect(class="mask mask--"+planet, width="0", height="25", y="0")
  // Path for orbit
  path(class="orbit orbit--"+planet, stroke=color, d=path, id="orbit--"+planet)
  // Path for trail, same as orbit - gets exposed by clippath
  path(class="trail trail--"+planet, stroke=color, d=path, clip-path="url(#trail"+planet+")")
  // Circle for planet
  circle(class="planet planet--"+planet, r=3, fill=color)


header
  h1="The Solar System from 2010 to 2020"
  h2(id="year")="2020"
  button(id="button", onClick="playAnimation()")="Pause"
    
svg(class="solarsystem")
  circle(class="sun", r="2", fill="#fff")

  //- Template for each planet
  each planet in planets
    g(id=planet.name)
      +planetize(planet.name,planet.au, planet.color)
!

CSS 

              
                body {
  background: #17171b;
  color: #ffffff;
  margin: 0;
  font-family: "Space Mono";
}
svg {
  height: 100vh;
  width: 100vw;
  position: fixed;
  top: 50%;
  left: 50%;
  overflow: visible;
}

header {
  position: fixed;
  z-index: 1;
  top: 100px;
  width: 100vw;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  color: rgba(255,255,255,.75);
}

h1 {
  font-size: 14px;
  font-weight: 100;
  text-transform: uppercase;
  margin: 0;
}

h2{
  font-size: 64px;
  color: rgba(255,255,255,1);
  font-weight: 100;
  margin: 0;
}

button {
  font-family: "Space Mono";
  font-size: 12px;
  background: transparent;
  color: #fff;
  font-weight: 100;
  text-transform: uppercase;
  padding: 5px 20px;
}

.solarsystem {
  height: 100%;
  width: 100%;
  position: fixed;
  bottom: -35%;
  transform: rotate3d(1,0,0,65deg);
}

.planet {
  transform-box: fill-box;
  transform-origin: 100% 100%;
}

.orbit,
.trail { 
  fill: transparent;
  stroke-width: 3;
  stroke-opacity: .25;
}

.trail {
  stroke-opacity: 1;
}
!

JS 

              
                gsap.registerPlugin(MotionPathPlugin);

//Get SVG path data from HTML, derived from Pug mixin
const mercuryOrbit = document.getElementById("orbit--mercury").getAttribute("d");
const venusOrbit = document.getElementById("orbit--venus").getAttribute("d");
const earthOrbit = document.getElementById("orbit--earth").getAttribute("d");
const marsOrbit = document.getElementById("orbit--mars").getAttribute("d");
const jupiterOrbit = document.getElementById("orbit--jupiter").getAttribute("d");
const saturnOrbit = document.getElementById("orbit--saturn").getAttribute("d");
const uranusOrbit = document.getElementById("orbit--uranus").getAttribute("d");
const neptuneOrbit = document.getElementById("orbit--neptune").getAttribute("d");

//Variables 
let button = document.getElementById("button");
let yearDisplay = document.getElementById("year");
let currentYear = {year:2020};
let dur = 2;
let ease= "power1.inOut";
let trail = 50;
let tl = gsap.timeline()

//Functions
//Update current year display
function countYear() {
  yearDisplay.innerHTML = currentYear.year;
}
//Toggle button text
function toggleButtonText() {
  if (button.innerHTML == "Play") {
    button.innerHTML = "Pause"
  } else {
    button.innerHTML = "Play"
  }
}
//Play and pause the timeline
function playAnimation() {
  tl.paused() ? tl.play() : tl.pause();
  toggleButtonText();
}

//GSAP ANIMATION TIMELINE 
//********************************************************

//Animate year count between 2020 and 2010
tl.to(currentYear,{
  year:"-=10",
  roundProps:"year",
  duration: dur,
  ease: ease,
  onUpdate:function(){
    countYear();
  }}, 0);

//Mercury
/////////////////////////////////////////////////////////
tl.to(".planet--mercury", {
  motionPath: {
    path: mercuryOrbit,
    start: .27,
    end: 40.89
  },
  duration: dur,
  ease: ease,
  immediateRender: true    
},0);

tl.to(".mask--mercury", {
    motionPath: {
      path: mercuryOrbit,
      autoRotate: true,
      start: .27,
      end: 40.89
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--mercury", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--mercury", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);

tl.fromTo(".mask--mercury",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);



//Venus
/////////////////////////////////////////////////////////
tl.to(".planet--venus", {
  motionPath: {
    path: venusOrbit,
    start: .99,
    end: 17.22
  },
  duration: dur,
  ease: ease,
  immediateRender: true
},0);

tl.to(".mask--venus", {
    motionPath: {
      path: venusOrbit,
      autoRotate: true,
      start: .99,
      end: 17.22
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--venus", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--venus", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);

tl.fromTo(".mask--venus",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);




//Earth
/////////////////////////////////////////////////////////
tl.to(".planet--earth", {
  motionPath: {
    path: earthOrbit,
    start: .72,
    end: 10.72
  },
  duration: dur,
  ease: ease,
  immediateRender: true  
},0);

tl.to(".mask--earth", {
    motionPath: {
      path: earthOrbit,
      autoRotate: true,
      start: .72,
      end: 10.72
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--earth", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--earth", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);

tl.fromTo(".mask--earth",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);



//Mars
/////////////////////////////////////////////////////////
tl.to(".planet--mars", {
  motionPath: {
    path: marsOrbit,
    start: .39,
    end: 5.67
  },
  duration: dur,
  ease: ease,
  immediateRender: true
}, 0);

tl.to(".mask--mars", {
    motionPath: {
      path: marsOrbit,
      autoRotate: true,
      start: .39,
      end: 5.67
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--mars", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--mars", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);

tl.fromTo(".mask--mars",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);


//Jupiter
/////////////////////////////////////////////////////////
tl.to(".planet--jupiter", {
  motionPath: {
    path: jupiterOrbit,
    autoRotate: true,
    start: .23,
    end: 1.07
  },
  duration: dur,
  ease: ease,
  immediateRender: true,
},0);


tl.to(".mask--jupiter", {
    motionPath: {
      path: jupiterOrbit,
      autoRotate: true,
      start: .23,
      end: 1.07
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--jupiter", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--jupiter", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);

tl.fromTo(".mask--jupiter",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);



//Saturn
/////////////////////////////////////////////////////////
tl.to(".planet--saturn", {
  motionPath: {
    path: saturnOrbit,
    autoRotate: true,
    start: .17,
    end: .51
  },
  duration: dur,
  ease: "power1.inOut",
  immediateRender: true,
},0);

tl.to(".mask--saturn", {
    motionPath: {
      path: saturnOrbit,
      autoRotate: true,
      start: .17,
      end: .51
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--saturn", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--saturn", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);

tl.fromTo(".mask--saturn",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);



//Uranus
/////////////////////////////////////////////////////////
tl.to(".planet--uranus", {
  motionPath: {
    path: uranusOrbit,
    autoRotate: true,
    start: .9,
    end: 1.02
  },
  duration: dur,
  ease: ease,
  immediateRender: true,
},0);


tl.to(".mask--uranus", {
    motionPath: {
      path: uranusOrbit,
      autoRotate: true,
      start: .9,
      end: 1.02
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--uranus", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--uranus", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);

tl.fromTo(".mask--uranus",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);



//Neptune
/////////////////////////////////////////////////////////
tl.to(".planet--neptune", {
  motionPath: {
    path: neptuneOrbit,
    autoRotate: true,
    start: .04,
    end: .1
  },
  duration: dur,
  ease: "power1.inOut",
  immediateRender: true,
},0);

tl.to(".mask--neptune", {
    motionPath: {
      path: neptuneOrbit,
      autoRotate: true,
      start: .04,
      end: .1
    },
    scaleX: 1,
    duration: dur,
    ease: ease,
    immediateRender: true,
},0);

tl.to(".mask--neptune", { 
    width: trail, 
    duration: dur/2,
    ease: ease,
},0);

tl.to(".mask--neptune", { 
    width: 0, 
    duration: dur/2,
    ease: ease,
},1);


tl.fromTo(".mask--neptune",{ 
  scaleX: -1 }, { 
  scaleX: -1, duration: dur
}, 0);

//Start and configure timeline
/////////////////////////////////////////////////////////
tl.yoyo(true).repeat(-1).repeatDelay(.25);
tl.play();
!
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